Her pelvis looks too small in relationship with the rest of her anatomy. What you could also do to make this pose more interesting is to add more gesture and looseness to the pose. That way, you might find something that you can add or take away as you're constructing this pose.

Another thing that you can explore in your future characters is displaying weight in how they stand, showing that they are standing on firm ground. Instead of drawing the head first and work your way down, try drawing the feet first. Get the proper footing and show the weight they display as they stand.